You cannot pay with a credit card. Fill out the money order at the counter with a retail associate.You typically can't buy a money order with a credit card. Instead, you'll need to use cash or a debit card that takes funds directly from your bank account. 1. Fill in the payee's name. Put the payee's name on the line labeled "Pay to the order of" or "Pay to. To fill out a money order you need to first fill out the who the payee is, the purchasers information and sign it. • Enter full 16-digit Travel Card account number on the memo line of the check or money order. • Detach payment coupon from statement and include with check. You'll also need a way to pay, such as cash or a debit card.